Electric knife base



FIG. 1 is a front elevational view of an electric knife base showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a rear elevational view thereof; and

FIG. 6 is a front elevational view thereof with the cover in an open position. 

The ornamental design for an electric knife base, as shown and described. 